Overview of Mercator Ocean CalVal activities 1 Operational

1. Operational assessment of the real -time mercator ocean analyses and forecasts Verbrugge Nathalie

Real-time Mercator-Ocean products Since April 2008, Mercator runs a global ocean configuration at ¼°

Residual vs Innovation in SLA Assimilation performance The assimilation performance is monitored in the

Calibration/Validation procedure Before the distribution of its real-time products, Mercator-Ocean checks the quality with

Comparisons of zonal velocities with some drifters from the CORIOLIS Database Drifters vs SURCOUF

Sea Ice Cersat Sea Ice Concentration Hindcast Sea Ice Concentration from ¼° Global system

Work in progress 1. 2. 3. 4. Qualification of meso scale processes Qualification of

2. Qualification of reanalysis products: example of GLORYS 1 V 1 Nicolas Ferry 1,

Scientific qualification process • Check at least over a one year experiment: – the

In situ average innovations/residuals PSY 3 V 2 R 2 Example: SSS in 2007:

Processes : example convection in the Labrador Sea Same diagnostic in GLORYS Seasonal-to-interannual development

Ideas for routine monitoring of the GOOS • Edit a quartely bulletin including: –

3. Trace the history of the quality of the production system - quarterly bulletin

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Overview of Mercator Ocean Cal/Val activities 1. Operational assessment of the real time Mercator ocean analyses and forecast 2. Scientific qualification of the systems and qualification of reanalyses products 3. Trace the history of the quality of the production systems 4. R&D validation targeted studies

1. Operational assessment of the real -time mercator ocean analyses and forecasts Verbrugge Nathalie 2, Pene Nicolas 2, Greiner Eric 2, Drévillon Marie 1, Lellouche Jean-Michel 1, Benkiran Mounir 2, Hernandez Fabrice 1, Nouel Lucas 1, Vinay Gaëtan 1 1 Mercator-Ocean, Toulouse, France 2 CLS, Toulouse, France

Real-time Mercator-Ocean products Since April 2008, Mercator runs a global ocean configuration at ¼° horizontal resolution and a North Atlantic and Mediterranean zoom at 1/12°. The real time operation of these systems produces each week realistic 3 -dimensional oceanic conditions including a hindcast and forecast. Moreover, the regional zoom is operated daily to produce 7 day forecast with daily updates of the atmospheric ECMWF forcing. To fulfil the operational assessment of the quality of the system outputs, more than 1300 graphics per week are produced and visualised by an team of operators through web pages. A step-by-step document guides them through the validation process. It contains expected nominal values, description of oceanographic structures/water masses …

Residual vs Innovation in SLA Assimilation performance The assimilation performance is monitored in the observations space Probability density function : (in situ Coriolis profiles, ½° SST RTG, and altimeters) and the Guess SSTquality difference vs input data sets is supervised. delivery of the NOAA/RTG analysis Temperature residual / in situ Coriolis

Calibration/Validation procedure Before the distribution of its real-time products, Mercator-Ocean checks the quality with a Calibration/Validation procedure. This assessment procedure is operated automatically • Outputs are compared to independent observations (Cersat Sea Ice concentration and drifts, Odyssea High resolution SST, Coriolis drifters, T/S climatology, historical data sets…). • Hindcast, nowcast and forecasts are inter-compared to check the consistency of the production. • Some MERSEA metrics (mooring points and 2 D oceanic sections) are also used.

Comparisons of zonal velocities with some drifters from the CORIOLIS Database Drifters vs SURCOUF Drifters vs ¼° Hindcast Global system : 2 D map and dispersion diagram SURCOUF : CLS analysed gridded velocity products from altimetry and drifters

Sea Ice Cersat Sea Ice Concentration Hindcast Sea Ice Concentration from ¼° Global system 28 -05 -2008

Work in progress 1. 2. 3. 4. Qualification of meso scale processes Qualification of nesting zones Qualification of biological variables Qualification of IBI system for coastal downstream applications 5. Routine intercomparisons of systems (quality/performance) Charly régnier 1, Bruno Levier 1, Abdelali El Moussaoui 1, Claire Maraldi 2, Fabrice Hernandez 1 1. Mercator-Ocean 2. Mercator/LEGOS

2. Qualification of reanalysis products: example of GLORYS 1 V 1 Nicolas Ferry 1, Laurent parent 1, Eric Greiner 2, Marie Drévillon 1, Elisabeth Rémy 3 1 Mercator-Ocean, Toulouse, France 2 CLS, Toulouse, France 3 CERFACS, Toulouse, France

Scientific qualification process • Check at least over a one year experiment: – the statistics: • Data assimilation statistics (mainly misfit average and RMS) • Comparisons with independent data (drifters, tide gauges) • Etc… – The physics: • Seasonal and interannual signals • High frequencies and analysis jumps • Equatorial waves • Volume transports • Etc. . • Try to analyze: – The systematic biases – The modes and tendencies

SLA assimilation scores

In situ average innovations/residuals PSY 3 V 2 R 2 Example: SSS in 2007: • Real time data for PSY 3 V 2 R 2 • reprocessed data for GLORYS

Processes : example convection in the Labrador Sea Same diagnostic in GLORYS Seasonal-to-interannual development of potential temperature (…) in the central Labrador Sea (Figure from “Enhanced production of Labrador Sea Water in 2008, Igor Yashayaev and John W. Loder, GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L 01606, doi: 10. 1029/2008 GL 036162, 2009”).

Ideas for routine monitoring of the GOOS • Edit a quartely bulletin including: – Black lists, grey lists – Record of data status – Record of geographical gaps • Sensitivity studies in reanalysis mode (see Elisabeth Remy in session 3)

3. Trace the history of the quality of the production system - quarterly bulletin (in progress) 4. R&D validation targeted studies - process studies - OSE/OSSE etc…